<script setup>
import {reactive, ref} from 'vue'
import {Delete, Edit, EditPen, Plus, Promotion, RefreshRight, Search, View} from '@element-plus/icons-vue'
import moment from 'moment'
import {deleteArticle, getArticleDetail, getArticlePageList, publishArticle, updateArticle} from '@/api/admin/article'
import {showMessage, showModel} from "@/composables/util.js";
import {MdEditor} from "md-editor-v3";
import 'md-editor-v3/lib/style.css'
import {uploadFile} from "@/api/admin/file.js";
import {getCategorySelectList} from "@/api/admin/category.js";
import {getTagSelectList, searchTags} from "@/api/admin/tag.js";

// 模糊搜索的文章标题
const searchArticleTitle = ref('')
// 日期
const pickDate = ref('')

// 查询条件：开始结束时间
const startDate = reactive({})
const endDate = reactive({})

// 监听日期组件改变事件，并将开始结束时间设置到变量中
const datepickerChange = (e) => {
  startDate.value = moment(e[0]).format('YYYY-MM-DD')
  endDate.value = moment(e[1]).format('YYYY-MM-DD')

  console.log('开始时间：' + startDate.value + ', 结束时间：' + endDate.value)
}

const shortcuts = [
  {
    text: '最近一周',
    value: () => {
      const end = new Date()
      const start = new Date()
      start.setTime(start.getTime() - 3600 * 1000 * 24 * 7)
      return [start, end]
    },
  },
  {
    text: '最近一个月',
    value: () => {
      const end = new Date()
      const start = new Date()
      start.setTime(start.getTime() - 3600 * 1000 * 24 * 30)
      return [start, end]
    },
  },
  {
    text: '最近三个月',
    value: () => {
      const end = new Date()
      const start = new Date()
      start.setTime(start.getTime() - 3600 * 1000 * 24 * 90)
      return [start, end]
    },
  },
]

// 重置
const reset = () => {
  pickDate.value = ''
  startDate.value = null
  endDate.value = null
  searchArticleTitle.value = ''
}

// 表格加载 Loading
const tableLoading = ref(false)
// 表格数据
const tableData = ref([])
// 当前页码，给了一个默认值 1
const current = ref(1)
// 总数据量，给了个默认值 0
const total = ref(0)
// 每页显示的数据量，给了个默认值 10
const size = ref(10)

// 获取分页数据
function getTableData() {
  // 显示表格 loading
  tableLoading.value = true
  // 调用后台分页接口，并传入所需参数
  getArticlePageList({
    current: current.value,
    size: size.value,
    startDate: startDate.value,
    endDate: endDate.value,
    title: searchArticleTitle.value
  })
      .then((res) => {
        if (res.code === 0) {
          tableData.value = res.data.records
          current.value = res.data.current
          size.value = res.data.size
          total.value = res.data.total
        }
      })
      .finally(() => tableLoading.value = false) // 隐藏表格 loading
}

getTableData()

// 每页展示数量变更事件
const handleSizeChange = (chooseSize) => {
  console.log('选择的页码' + chooseSize)
  size.value = chooseSize
  getTableData()
}

// 删除文章
const deleteArticleSubmit = (row) => {
  console.log(row)
  showModel('是否确定要删除该文章？').then(() => {
    deleteArticle(row.id).then((res) => {
      console.log('删除文章：' + res)
      if (res.code === 0) {
        // 获取服务端返回的错误消息
        let message = res.description
        // 提示错误消息
        showMessage(message, 'error')
        return
      }

      showMessage('删除成功')
      // 重新请求分页接口，渲染数据
      getTableData()
    })
  }).catch(() => {
    console.log('取消了')
  })
}

// 是否显示文章发布对话框
const isArticlePublishEditorShow = ref(false)
// 发布文章表单引用
const publishArticleFormRef = ref(null)

// 表单对象
const form = reactive({
  id: null,
  title: '',
  content: '请输入内容',
  cover: '',
  categoryId: null,
  categoryName: '',
  tags: [],
  summary: "",
  createDate: ""
})

// 表单校验规则
const rules = {
  title: [
    {required: true, message: '请输入文章标题', trigger: 'blur'},
    {min: 1, max: 40, message: '文章标题要求大于1个字符，小于40个字符', trigger: 'blur'},
  ],
  content: [{required: true}],
  cover: [{required: true}],
  categoryId: [{required: true, message: '请选择文章分类', trigger: 'blur'}],
  tags: [{required: true, message: '请选择文章标签', trigger: 'blur'}],
}

// 上传文章封面图片
const handleCoverChange = (file) => {
  // 表单对象
  let formData = new FormData()
  // 添加 file 字段，并将文件传入
  formData.append('file', file.raw)
  uploadFile(formData).then((e) => {
    // 响参失败，提示错误消息
    if (e.code !== 0) {
      let message = e.message
      showMessage(message, 'error')
      return
    }

    // 成功则设置表单对象中的封面链接，并提示上传成功
    form.cover = e.data.url
    showMessage('上传成功')
  })
}

// 编辑器图片上传
const onUploadImg = async (files, callback) => {
  const res = await Promise.all(
      files.map((file) => {
        return new Promise((rev, rej) => {
          console.log('==> 编辑器开始上传文件...')
          let formData = new FormData()
          formData.append("file", file);
          uploadFile(formData).then((res) => {
            console.log(res)
            console.log('访问路径：' + res.data.url)
            // 调用 callback 函数，回显上传图片
            callback([res.data.url]);
          })
        });
      })
  );
}

// 文章分类
const categories = ref([])
getCategorySelectList().then((e) => {
  console.log('获取分类数据', e)
  categories.value = e.data
})

// 标签 select Loading 状态，默认不显示
const tagSelectLoading = ref(false)
// 文章标签
const tags = ref([])
// 渲染标签数据
getTagSelectList().then(res => {
  tags.value = res.data
})

// 根据用户输入的标签名称，远程模糊查询
const remoteMethod = (query) => {
  console.log('远程搜索：' + tags.value)
  // 如果用户的查询关键词不为空
  if (query) {
    // 显示 loading
    tagSelectLoading.value = true
    // 调用标签模糊查询接口
    searchTags(query).then((e) => {
      console.log('获取标签数据', e)
      if (e.code === 0) {
        // 设置到 tags 变量中
        tags.value = e.data
      }
    }).finally(() => tagSelectLoading.value = false) // 隐藏 loading
  }
}

// 发布文章
const publishArticleSubmit = () => {
  console.log('提交 md 内容：' + form.content)
  // 校验表单
  publishArticleFormRef.value.validate((valid) => {
    if (!valid) {
      return false
    }

    publishArticle(form).then((res) => {
      if (res.code !== 0) {
        // 获取服务端返回的错误消息
        let message = res.description
        // 提示错误消息
        showMessage(message, 'error')
        return
      }

      showMessage('发布成功')
      // 隐藏发布文章对话框
      isArticlePublishEditorShow.value = false
      // 将 form 表单字段置空
      form.title = ''
      form.content = ''
      form.cover = ''
      form.summary = ''
      form.categoryId = null
      form.tags = []
      // 重新请求分页接口，渲染列表数据
      getTableData()
    })
  })
}

// 是否显示编辑文章对话框
const isArticleUpdateEditorShow = ref(false)
// 编辑文章表单引用
const updateArticleFormRef = ref(null)

// 修改文章表单对象
const updateArticleForm = reactive({
  id: null,
  title: '',
  content: '请输入内容',
  cover: '',
  categoryId: null,
  tags: [],
  summary: ""
})

// 编辑文章：上传文章封面图片
const handleUpdateCoverChange = (file) => {
  // 表单对象
  let formData = new FormData()
  // 添加 file 字段，并将文件传入
  formData.append('file', file.raw)
  uploadFile(formData).then((e) => {
    // 响参失败，提示错误消息
    if (e.code !== 0 ) {
      let message = e.message
      showMessage(message, 'error')
      return
    }

    // 成功则设置表单对象中的封面链接，并提示上传成功
    updateArticleForm.cover = e.data.url
    showMessage('上传成功')
  })
}

// 编辑文章按钮点击事件
const showArticleUpdateEditor = (row) => {
  // 显示编辑文章对话框
  isArticleUpdateEditorShow.value = true
  // 拿到文章 ID
  let articleId = row.id
  getArticleDetail(articleId).then((res) => {
    if (res.code === 0) {
      // 设置表单数据
      updateArticleForm.id = res.data.id
      updateArticleForm.title = res.data.title
      updateArticleForm.cover = res.data.cover
      updateArticleForm.content = res.data.content
      updateArticleForm.categoryId = res.data.categoryId
      updateArticleForm.categoryName = res.data.categoryName
      updateArticleForm.tags = res.data.tags
      updateArticleForm.summary = res.data.summary
    }
  })
}

// 保存文章
const updateSubmit = () => {
  updateArticleFormRef.value.validate((valid) => {
    // 校验表单
    if (!valid) {
      return false
    }

    // 请求更新文章接口
    updateArticle(updateArticleForm).then((res) => {
      if (res.code !== 0) {
        // 获取服务端返回的错误消息
        let message = res.description
        // 提示错误消息
        showMessage(message, 'error')
        return
      }

      showMessage('保存成功')
      // 隐藏编辑框
      isArticleUpdateEditorShow.value = false
      // 重新请求分页接口，渲染列表数据
      getTableData()
    })
  })
}

import { useRouter } from 'vue-router'

const router = useRouter()
// 跳转文章详情页
const goArticleDetailPage = (articleId) => {
  router.push('/article/' + articleId)
}
</script>

<template>
  <div>
    <!-- 表头分页查询条件， shadow="never" 指定 card 卡片组件没有阴影 -->
    <el-card shadow="never" class="mb-5">
      <!-- flex 布局，内容垂直居中 -->
      <div class="flex items-center">
        <el-text>文章标题</el-text>
        <div class="ml-3 w-52 mr-5">
          <el-input v-model="searchArticleTitle" placeholder="请输入（模糊查询）"/>
        </div>

        <el-text>创建日期</el-text>
        <div class="ml-3 w-30 mr-5">
          <!-- 日期选择组件（区间选择） -->
          <el-date-picker v-model="pickDate" type="daterange" range-separator="至" start-placeholder="开始时间"
                          end-placeholder="结束时间" size="default" :shortcuts="shortcuts" @change="datepickerChange"/>
        </div>

        <el-button type="primary" class="ml-3" :icon="Search" @click="getTableData">查询</el-button>
        <el-button class="ml-3" :icon="RefreshRight" @click="reset">重置</el-button>
      </div>
    </el-card>

    <el-card shadow="never">
      <!-- 写文章按钮 -->
      <div class="mb-5">
        <el-button type="primary" @click="isArticlePublishEditorShow = true">
          <el-icon class="mr-1">
            <EditPen/>
          </el-icon>
          写文章
        </el-button>
      </div>

      <!-- 写博客 -->
      <el-dialog v-model="isArticlePublishEditorShow" :fullscreen="true" :show-close="false" :close-on-press-escape="false">
        <template #header="{ close, titleId, titleClass }">
          <!-- 固钉组件，固钉到顶部 -->
          <el-affix :offset="20" style="width: 100%;">
            <!-- 指定 flex 布局， 高度为 10， 背景色为白色 -->
            <div class="flex h-10 bg-white">
              <!-- 字体加粗 -->
              <h4 class="font-bold">写文章</h4>
              <!-- 靠右对齐 -->
              <div class="ml-auto flex">
                <el-button @click="isArticlePublishEditorShow = false">取消</el-button>
                <el-button type="primary" @click="publishArticleSubmit">
                  <el-icon class="mr-1">
                    <Promotion/>
                  </el-icon>
                  发布
                </el-button>
              </div>
            </div>
          </el-affix>
        </template>
        <!-- label-position="top" 用于指定 label 元素在上面 -->
        <el-form :model="form" ref="publishArticleFormRef" label-position="top" size="large" :rules="rules">
          <el-form-item label="标题" prop="title">
            <el-input v-model="form.title" autocomplete="off" size="large" maxlength="40" show-word-limit
                      clearable/>
          </el-form-item>
          <el-form-item label="内容" prop="content">
            <!-- Markdown 编辑器 -->
            <MdEditor v-model="form.content" @onUploadImg="onUploadImg" editorId="publishArticleEditor"/>
          </el-form-item>
          <el-form-item label="封面" prop="cover">
            <el-upload class="avatar-uploader" action="#" :on-change="handleCoverChange" :auto-upload="false"
                       :show-file-list="false">
              <img v-if="form.cover" :src="form.cover" class="avatar"/>
              <el-icon v-else class="avatar-uploader-icon">
                <Plus/>
              </el-icon>
            </el-upload>
          </el-form-item>
          <el-form-item label="摘要" prop="summary">
            <!-- :rows="3" 指定 textarea 默认显示 3 行 -->
            <el-input v-model="form.summary" :rows="3" type="textarea" placeholder="请输入文章摘要"/>
          </el-form-item>
          <el-form-item label="分类" prop="categoryId">
            <el-select v-model="form.categoryId" clearable placeholder="---请选择---" size="large">
             <el-option v-for="item in categories" :key="item.id" :label="item.name" :value="item.id"/>
            </el-select>
          </el-form-item>
          <el-form-item label="标签" prop="tags">
              <span class="w-60">
                        <!-- 标签选择 -->
                    <el-select v-model="form.tags" multiple filterable remote reserve-keyword placeholder="请输入文章标签"
                               remote-show-suffix allow-create default-first-option :remote-method="remoteMethod" :loading="tagSelectLoading"
                               size="large">
                        <el-option v-for="item in tags" :key="item.id" :label="item.name" :value="item.name" />
                    </el-select>
             </span>
          </el-form-item>
        </el-form>
      </el-dialog>

      <!-- 编辑博客 -->
      <el-dialog v-model="isArticleUpdateEditorShow" :fullscreen="true" :show-close="false"
                 :close-on-press-escape="false">
        <template #header="{ close, titleId, titleClass }">
          <!-- 固钉组件，固钉到顶部 -->
          <el-affix :offset="20" style="width: 100%;">
            <!-- 指定 flex 布局， 高度为 10， 背景色为白色 -->
            <div class="flex h-10 bg-white">
              <!-- 字体加粗 -->
              <h4 class="font-bold">编辑文章</h4>
              <!-- 靠右对齐 -->
              <div class="ml-auto flex">
                <el-button @click="isArticleUpdateEditorShow = false">取消</el-button>
                <el-button type="primary" @click="updateSubmit">
                  <el-icon class="mr-1">
                    <Promotion />
                  </el-icon>
                  保存
                </el-button>
              </div>
            </div>
          </el-affix>
        </template>
        <!-- label-position="top" 用于指定 label 元素在上面 -->
        <el-form :model="updateArticleForm" ref="updateArticleFormRef" label-position="top" size="large" :rules="rules">
          <el-form-item label="标题" prop="title">
            <el-input v-model="updateArticleForm.title" autocomplete="off" size="large" maxlength="40"
                      show-word-limit clearable />
          </el-form-item>
          <el-form-item label="内容" prop="content">
            <!-- Markdown 编辑器 -->
            <MdEditor v-model="updateArticleForm.content" @onUploadImg="onUploadImg"
                      editorId="updateArticleEditor" />
          </el-form-item>
          <el-form-item label="封面" prop="cover">
            <el-upload class="avatar-uploader" action="#" :on-change="handleUpdateCoverChange" :auto-upload="false"
                       :show-file-list="false" style="height: 100px;width: 100px">
              <img v-if="updateArticleForm.cover" :src="updateArticleForm.cover" class="avatar" />
              <el-icon v-else class="avatar-uploader-icon">
                <Plus />
              </el-icon>
            </el-upload>
          </el-form-item>
          <el-form-item label="摘要" prop="summary">
            <!-- :rows="3" 指定 textarea 默认显示 3 行 -->
            <el-input v-model="updateArticleForm.summary" :rows="3" type="textarea" placeholder="请输入文章摘要" />
          </el-form-item>
          <el-form-item label="分类" prop="categoryId">
            <el-select v-model="updateArticleForm.categoryName" clearable placeholder="---请选择---" size="large">
              <el-option v-for="item in categories" :key="item.id" :label="item.name" :value="item.name" />
            </el-select>
          </el-form-item>
          <el-form-item label="标签" prop="tags">
                    <span class="w-60">
                        <!-- 标签选择 -->
                        <el-select v-model="updateArticleForm.tags" multiple filterable remote reserve-keyword
                                   placeholder="请输入文章标签" remote-show-suffix allow-create default-first-option
                                   :remote-method="remoteMethod" :loading="tagSelectLoading" size="large">
                            <el-option v-for="item in tags" :key="item.id" :label="item.name" :value="item.name" />
                        </el-select>
                    </span>
          </el-form-item>
        </el-form>
      </el-dialog>

      <!-- 分页列表 -->
      <el-table :data="tableData" border stripe style="width: 100%" v-loading="tableLoading">
        <el-table-column prop="id" label="ID" width="50" />
        <el-table-column prop="title" label="标题" width="380"/>
        <el-table-column prop="cover" label="封面" width="180">
          <template #default="scope">
            <el-image style="width: 100px;" :src="scope.row.cover"/>
          </template>
        </el-table-column>
        <el-table-column prop="createTime" label="发布时间" width="180"/>
        <el-table-column label="操作">
          <template #default="scope">
            <el-button size="small" @click="showArticleUpdateEditor(scope.row)">
              <el-icon class="mr-1">
                <Edit />
              </el-icon>
              编辑</el-button>
            <el-button size="small" @click="goArticleDetailPage(scope.row.id)">
              <el-icon class="mr-1">
                <View />
              </el-icon>
              预览</el-button>
            <el-button type="danger" size="small" @click="deleteArticleSubmit(scope.row)">
              <el-icon class="mr-1">
                <Delete />
              </el-icon>
              删除
            </el-button>
          </template>
        </el-table-column>
      </el-table>

      <!-- 分页 -->
      <div class="mt-10 flex justify-center">
        <el-pagination v-model:current-page="current" v-model:page-size="size" :page-sizes="[10, 20, 50]"
                       :small="false" :background="true" layout="total, sizes, prev, pager, next, jumper"
                       :total="total" @size-change="handleSizeChange" @current-change="getTableData"/>
      </div>

    </el-card>


  </div>
</template>

<style scoped>
.md-editor-footer {
  height: 40px;
}

/* 指定 select 下拉框宽度 */
.el-select--large {
  width: 600px;
}

/* 封面图片样式 */
.avatar-uploader .avatar {
  width: 200px;
  height: 100px;
  display: block;
}

.el-icon.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 200px;
  height: 100px;
  text-align: center;
}

</style>